Study on the instability of early age 3D printing cement-based structure– considering the influence of interface

Abstract

Early collapse poses a significant challenge in the realm of three-dimensional printing concrete (3DPC) processes. Concurrently, the interface assumes a pivotal role in influencing the structural performance of 3DPC. However, the influence of the interface is seldom considered in detail in early collapse predictions. To address this issue, a novel 3D printing cement-based structure model that incorporates the influence of interface performance is proposed by introducing the concept of an equivalent interface. The computational model was constructed using the peridynamics (PD) method, incorporating parameter corrections for specific bonds to account for interface effects. The results demonstrated that, compared with the exaggerated failure height of cylinder structures simulated in most similar studies, the model with equivalent interface effectively reduced the number of failure layers and the simulation results were closer to the experimental results. Furthermore, we conduct a thorough investigation into the impact of different degrees of interface performance attenuation on the failure height of cylindrical structures, offering comprehensive insights into the underlying mechanisms. These findings contribute to addressing the pressing issue of early collapse in 3DPC processes and offer valuable implications for accurately predicting the failure height of printed concrete components.